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This is what you should pay attention to for differential pressure measurement

Each pressure measurement parameter relates to a reference pressure: with absolute pressure to vacuum, with relative pressure to the environment. When you measure differential pressure, you record the pressure difference between two values defined by you.

That is why a differential pressure measuring device always has two connections. Unlike an absolute pressure meter, which only needs one connection.

This means a differential pressure measuring instrument can also measure relative pressure.

Depending on the reference value, the measurement result can therefore be positive (+) or negative (-), that is indicating either an overpressure or a negative pressure.

It all depends on the differential pressure sensor

A measuring instrument can only be as accurate as its sensor. Testo's differential pressure sensors are highly sensitive, temperature-compensated and at the same time small and robust. This also makes them ideally suited for critical applications.

Differential pressure gauge in use: the most common areas of application

Practical know-how for differential pressure measurement: how to do it even better

Whether it is correct use of the pressure gauge or optional accessories which make the measurement process easier in difficult-to-access or contaminated measurement environments – our practical tips in the field of differential pressure measurement enable you to avoid the most common application errors and to get maximum precision and performance from your measuring instrument!

How to make the best use of your differential pressure measuring instrument

Right pressure? With differential pressure measurement, it is important to connect the right pressure to the right connection. Make sure that you connect the overpressure to the plus connection (+) and the negative pressure to the minus connection (-). This enables your differential pressure gauge to operate over the full measuring range – and you can count on high-precision measuring values.

Measure relative pressure: Did you know that you can also measure the relative pressure (that is the difference from the currently prevailing ambient pressure) with your Testo differential pressure measuring instrument? To do so, you simply leave one of the two pressure connections open and set the current ambient conditions as the reference value.

Measurement using a Pitot tube:
Use of a Pitot tube makes sense, especially for measurements in dusty and contaminated air. The air velocity in the flow duct of a system can for instance be determined via the differential pressure between dynamic and static pressure.

Replace air filter elements in good time:
Air filters in air conditioning systems have to regularly be subjected to a differential pressure measurement. A Testo pressure measuring instrument means you are on the safe side: the differential pressure probe can be connected to the filter's ports in next to no time. If the pressure difference before and after the filter reaches a critical value, there is a warning signal: you then know that a filter change is required so that the ventilation can continue to work properly.

Measure differential pressure in the cleanroom:If it is a case of ensuring standard-compliant operation in cleanrooms, the requirements in terms of the precision of the differential pressure measuring instrument could not be higher. The pressure difference between rooms of different cleanroom classes is precisely controlled – and has to be strictly adhered to. Because the minimum overpressure of the cleanroom ensures that, when the door is open, no air flow is created from the unclean room into the clean one, which would contaminate the latter. The standardized differential value is between 5 and 20 Pa. A Testo differential pressure gauge means you can be sure that your values are right.

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